Computer not working after dust clean-up

i was on my computer today and my brother and mother told me my computer fan has been coming on more often than before and than maybe i shoulod clear out dust .So i opened it up and disconnected all my cords then disconnected all the power cables inside so i could clear out the dust and then cleaned out the dust.Then i connected everything back together exactly as they were closed it up plugged all my cords in and started it up, however, the computer came on (lights came on as well as the fans) but thats all no booting sounds and nothing on my monitor

My computers used to do that sometimes... try taking things out one by one or just take everything and put it back in (what i always did when blowing dust out)... like the Ram - CPU - GFX card etc... and see if it that fixes it (whilst doing that blowing out the excess dust that may have fallen in between slots and pins)

Either you didn't reconnect something correctly or you did something 'non-smart' such as using a vacuum on your motherboard & other components. Vacuuming causes a static charge to build up which can in turn, fry the electronics. Unless your system was extremely dirty, all you needed to do was give it a good blast with compressed air....disconnecting anything is usually unnecessary.

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